The following Mark's Daily Apple article was written by Marksissons

and is narrated by Brock Armstrong.

The definitive guide to low-level aerobic activity.

Maybe you've found yourself feeling self-conscious on evening walks while five people

pass you, perhaps twice, in their best running forms. Perhaps you spent the day at the lake,

canoeing or hiking around the beach and later felt guilty for not having made it to the gym. Or

maybe you're frustrated having to mow or rake over the

weekend because it means giving up workout time in exchange. Message for the day, shed the guilt.

Forget the self-reproach and enjoy a little affirmation. We are talking about a favorite of mine,

low-level aerobic activity. Sure, it can feel

all too relaxed, even indulgent compared to the intense stuff, but don't be so quick to disparage.

Low-level aerobic activity, I'm here to tell you, is the crucial base of primal blueprint fitness.

Rule number three in my book, for those of you who are currently reading it. It's the base, the foundation, the keystone to the big fitness picture.

After all, it was how our good man Grok and his family spent most of their days,

carrying water from the stream, collecting firewood,

walking through the forests and meadows to gather greens, berries, and other plants,

working on their shelter,

perhaps migrating to another area because of drought, predators, or competing tribes.

Butchering, building, washing, cooking, dancing, you name it. Some of it was hard work,

but it was mostly just continual, the sheer volume of low-level activity that characterized GROC's

existence. If the human body evolved within these conditions, our lives today often leave us

as fish out of water. There's the joke about the old-time farmers laughing at people who pay to slog away on a treadmill

...